//
//  LZWebViewController.m
//  ShareDemo
//
//  Created by 微微 on 2019/3/6.
//  Copyright © 2019 链动科技. All rights reserved.
//

#import "LZWebViewController.h"

//WKWebView 内存不释放的问题
@interface WeakWebViewScriptMessageDelegate: NSObject <WKScriptMessageHandler>

//WKScriptMessageHandler 这个协议类专门用来处理JavaScript调用原生OC的方法
@property (nonatomic, weak) id<WKScriptMessageHandler> scriptDelegate;

- (instancetype)initWithDelegate:(id<WKScriptMessageHandler>)scriptDelegate;

@end
@implementation WeakWebViewScriptMessageDelegate

- (instancetype)initWithDelegate:(id<WKScriptMessageHandler>)scriptDelegate {
    self = [super init];
    if (self) {
        _scriptDelegate = scriptDelegate;
    }
    return self;
}

#pragma mark - WKScriptMessageHandler
//遵循WKScriptMessageHandler协议，必须实现如下方法，然后把方法向外传递
//通过接收JS传出消息的name进行捕捉的回调方法
- (void)userContentController:(WKUserContentController *)userContentController didReceiveScriptMessage:(WKScriptMessage *)message {
    
    if ([self.scriptDelegate respondsToSelector:@selector(userContentController:didReceiveScriptMessage:)]) {
        [self.scriptDelegate userContentController:userContentController didReceiveScriptMessage:message];
    }
}

@end


@interface LZWebViewController ()<WKScriptMessageHandler, WKUIDelegate, WKNavigationDelegate,UIGestureRecognizerDelegate>




@end

@implementation LZWebViewController

- (void)viewDidLoad {
    [super viewDidLoad];
        
    self.webView.userInteractionEnabled = NO;

    [self.view addSubview:self.webView];
    [self.view addSubview:self.progressView];
    //添加监测网页加载进度的观察者
    [self.webView addObserver:self
                   forKeyPath:NSStringFromSelector(@selector(estimatedProgress))
                      options:0
                      context:nil];
    [self.webView addObserver:self
                   forKeyPath:@"title"
                      options:NSKeyValueObservingOptionNew
                      context:nil];
    
    
    
    
    [self.webView mas_makeConstraints:^(MASConstraintMaker *make) {
        make.edges.mas_equalTo(0);
    }];
}

//kvo 监听进度 必须实现此方法
-(void)observeValueForKeyPath:(NSString *)keyPath
                     ofObject:(id)object
                       change:(NSDictionary<NSKeyValueChangeKey,id> *)change
                      context:(void *)context{
    
    if ([keyPath isEqualToString:NSStringFromSelector(@selector(estimatedProgress))]
        && object == _webView) {
        
        NSLog(@"网页加载进度 = %f",_webView.estimatedProgress);
        self.progressView.progress = _webView.estimatedProgress;
        if (_webView.estimatedProgress >= 1.0f) {
            dispatch_after(dispatch_time(DISPATCH_TIME_NOW, (int64_t)(0.3 * NSEC_PER_SEC)), dispatch_get_main_queue(), ^{
                self.progressView.progress = 0;
            });
        }
        
    }else if([keyPath isEqualToString:@"title"]
             && object == _webView){
        self.navigationItem.title = _webView.title;
    }else{
        [super observeValueForKeyPath:keyPath
                             ofObject:object
                               change:change
                              context:context];
    }
}

#pragma mark -- Event Handle

- (void)goBackAction:(id)sender{
    [_webView goBack];
}

- (void)localHtmlClicked{
    NSString *path = [[NSBundle mainBundle] pathForResource:@"JStoOC.html" ofType:nil];
    NSString *htmlString = [[NSString alloc]initWithContentsOfFile:path encoding:NSUTF8StringEncoding error:nil];
    [_webView loadHTMLString:htmlString baseURL:[NSURL fileURLWithPath:[[NSBundle mainBundle] bundlePath]]];
}

- (void)refreshAction:(id)sender{
    [_webView reload];
}

- (void)ocToJs{
    
    //OC调用JS  changeColor()是JS方法名，completionHandler是异步回调block
    NSString *jsString = [NSString stringWithFormat:@"hwajax('lvkaike%@')", @"测试下"];
    [_webView evaluateJavaScript:jsString completionHandler:^(id _Nullable data, NSError * _Nullable error) {
        NSLog(@"改变HTML的背景色");
    }];
    
    //改变字体大小 调用原生JS方法
    NSString *jsFont = [NSString stringWithFormat:@"document.getElementsByTagName('body')[0].style.webkitTextSizeAdjust= '%d%%'", arc4random()%99 + 100];
    [_webView evaluateJavaScript:jsFont completionHandler:nil];
    
}

#pragma mark -- Getter

- (UIProgressView *)progressView
{
    if (!_progressView){
        _progressView = [[UIProgressView alloc] initWithFrame:CGRectMake(0, 1, self.view.frame.size.width, 2)];
        _progressView.tintColor = [UIColor orangeColor];
        _progressView.trackTintColor = [UIColor clearColor];
    }
    return _progressView;
}

- (WKWebView *)webView{
    
    if(_webView == nil){
        
        //创建网页配置对象
        WKWebViewConfiguration *config = [[WKWebViewConfiguration alloc] init];
        
        // 创建设置对象
        WKPreferences *preference = [[WKPreferences alloc]init];
        //最小字体大小 当将javaScriptEnabled属性设置为NO时，可以看到明显的效果
        preference.minimumFontSize = 0;
        //设置是否支持javaScript 默认是支持的
        preference.javaScriptEnabled = YES;
        // 在iOS上默认为NO，表示是否允许不经过用户交互由javaScript自动打开窗口
        preference.javaScriptCanOpenWindowsAutomatically = YES;
        config.preferences = preference;
        
//        // 是使用h5的视频播放器在线播放, 还是使用原生播放器全屏播放
//        config.allowsInlineMediaPlayback = YES;
//        //设置视频是否需要用户手动播放  设置为NO则会允许自动播放
//        config.requiresUserActionForMediaPlayback = YES;
//        //设置是否允许画中画技术 在特定设备上有效
//        config.allowsPictureInPictureMediaPlayback = YES;
        //设置请求的User-Agent信息中应用程序名称 iOS9后可用
        NSDictionary *infoDict = [[NSBundle mainBundle] infoDictionary];
        // app名称
        NSString *appName = infoDict[@"CFBundleDisplayName"];
        config.applicationNameForUserAgent = appName;
        
        //自定义的WKScriptMessageHandler 是为了解决内存不释放的问题
        WeakWebViewScriptMessageDelegate *weakScriptMessageDelegate = [[WeakWebViewScriptMessageDelegate alloc] initWithDelegate:self];
        //这个类主要用来做native与JavaScript的交互管理
        WKUserContentController * wkUController = [[WKUserContentController alloc] init];
        //注册一个name为jsToOcNoPrams的js方法 设置处理接收JS方法的对象
        [wkUController addScriptMessageHandler:weakScriptMessageDelegate  name:@"clickDidClick"];
        [wkUController addScriptMessageHandler:weakScriptMessageDelegate  name:@"jsToOcWithPrams"];
        
        config.userContentController = wkUController;
        
//        //以下代码适配文本大小 , 但是这里 引起放大和缩小
//        NSString *jSString = @"var meta = document.createElement('meta'); meta.setAttribute('name', 'viewport'); meta.setAttribute('content', 'width=device-width'); document.getElementsByTagName('head')[0].appendChild(meta);";
//        //用于进行JavaScript注入
//        WKUserScript *wkUScript = [[WKUserScript alloc] initWithSource:jSString injectionTime:WKUserScriptInjectionTimeAtDocumentEnd forMainFrameOnly:YES];
//        [config.userContentController addUserScript:wkUScript];
        
        _webView = [[WKWebView alloc] initWithFrame:CGRectMake(0, 0, self.view.frame.size.width, self.view.frame.size.height) configuration:config];
        // UI代理
        _webView.UIDelegate = self;
        _webView.scrollView.backgroundColor = UIColor.clearColor;
        // 导航代理
        _webView.navigationDelegate = self;
        // 是否允许手势左滑返回上一级, 类似导航控制的左滑返回
        _webView.allowsBackForwardNavigationGestures = YES;
        

        //可返回的页面列表, 存储已打开过的网页
        WKBackForwardList * backForwardList = [_webView backForwardList];
        
        if(self.webType == LZWebLoadingTypeUrl){
            //加载网页
            NSURL *webUrl = [NSURL URLWithString:self.webUrl];
            NSURLRequest *urlRequest = [[NSURLRequest alloc] initWithURL:webUrl];
            [_webView loadRequest:urlRequest];
            
        } else {
            [_webView loadHTMLString:self.webUrl baseURL:nil];
        }
        
        //加载本地html
//        NSString *path = [[NSBundle mainBundle] pathForResource:@"main.html" ofType:nil];
//        NSString *htmlString = [[NSString alloc]initWithContentsOfFile:path encoding:NSUTF8StringEncoding error:nil];
//        [_webView loadHTMLString:self.webUrl baseURL:nil];

//        UILongPressGestureRecognizer *longPress = [[UILongPressGestureRecognizer alloc] initWithTarget:self action:@selector(longPressed:)];
//        longPress.delegate = self;   //记得在.h文件里加上<UIGestureRecognizerDelegate>委托
//        longPress.minimumPressDuration = 0.3;  //这里为什么要设置0.4，因为只要大于0.5就无效，我想是因为默认的跳出放大镜的手势的长按时间是0.5秒，
        
//        [_webView addGestureRecognizer:longPress];
    
        
    }
    return _webView;
}


//被自定义的WKScriptMessageHandler在回调方法里通过代理回调回来，绕了一圈就是为了解决内存不释放的问题
//通过接收JS传出消息的name进行捕捉的回调方法
- (void)userContentController:(WKUserContentController *)userContentController didReceiveScriptMessage:(WKScriptMessage *)message{
    NSLog(@"name:%@\\\\n body:%@\\\\n frameInfo:%@\\\\n",message.name,message.body,message.frameInfo);
    //用message.body获得JS传出的参数体
    NSDictionary * parameter = message.body;
    //JS调用OC
    if([message.name isEqualToString:@"jsToOcNoPrams"]){
        UIAlertController *alertController = [UIAlertController alertControllerWithTitle:@"js调用到了oc" message:@"不带参数" preferredStyle:UIAlertControllerStyleAlert];
        [alertController addAction:([UIAlertAction actionWithTitle:@"OK" style:UIAlertActionStyleDefault handler:^(UIAlertAction * _Nonnull action) {
        }])];
        [self presentViewController:alertController animated:YES completion:nil];
        
    }else if([message.name isEqualToString:@"jsToOcWithPrams"]){
        UIAlertController *alertController = [UIAlertController alertControllerWithTitle:@"js调用到了oc" message:parameter[@"params"] preferredStyle:UIAlertControllerStyleAlert];
        [alertController addAction:([UIAlertAction actionWithTitle:@"OK" style:UIAlertActionStyleDefault handler:^(UIAlertAction * _Nonnull action) {
        }])];
        [self presentViewController:alertController animated:YES completion:nil];
    }
    
}
#pragma mark - GestureRecognizerDelegate
- (BOOL)gestureRecognizer:(UIGestureRecognizer *)gestureRecognizer shouldRecognizeSimultaneouslyWithGestureRecognizer:(UIGestureRecognizer *)otherGestureRecognizer
{
    return NO; //这里一定要return NO,至于为什么大家去看看这个方法的文档吧。

}

- (void)longPressed:(UILongPressGestureRecognizer*)recognizer
{
    if (recognizer.state != UIGestureRecognizerStateBegan) {
        return;
    }
    CGPoint touchPoint = [recognizer locationInView:self.webView];
    // 获取长按位置对应的图片url的JS代码
    NSString *imgJS = [NSString stringWithFormat:@"document.elementFromPoint(%f, %f).src", touchPoint.x, touchPoint.y];
    // 执行对应的JS代码 获取url
    [self.webView evaluateJavaScript:imgJS completionHandler:^(id _Nullable imgUrl, NSError * _Nullable error) {
        if (imgUrl) {
            NSData *data = [NSData dataWithContentsOfURL:[NSURL URLWithString:imgUrl]];
            UIImage *image = [UIImage imageWithData:data];
            if (!image) {
                NSLog(@"读取图片失败");
                return;
            }
        }
    }];
    
}

#pragma mark -- WKNavigationDelegate
/*
 WKNavigationDelegate主要处理一些跳转、加载处理操作，WKUIDelegate主要处理JS脚本，确认框，警告框等
 */

// 页面开始加载时调用
- (void)webView:(WKWebView *)webView didStartProvisionalNavigation:(WKNavigation *)navigation {
    
    showLoadingTitle(@"", webView);
}

// 页面加载失败时调用
- (void)webView:(WKWebView *)webView didFailProvisionalNavigation:(null_unspecified WKNavigation *)navigation withError:(NSError *)error {
    dismiss(webView);
    [self.progressView setProgress:0.0f animated:NO];
}

// 当内容开始返回时调用
- (void)webView:(WKWebView *)webView didCommitNavigation:(WKNavigation *)navigation {
    
}

// 页面加载完成之后调用
- (void)webView:(WKWebView *)webView didFinishNavigation:(WKNavigation *)navigation {
    dismiss(webView);
    // 不执行前段界面弹出列表的JS代码
    [self.webView evaluateJavaScript:@"document.documentElement.style.webkitTouchCallout='none';" completionHandler:nil];
    [self.webView evaluateJavaScript:@"document.documentElement.style.webkitUserSelect='none';"completionHandler:nil];
    self.webView.userInteractionEnabled = YES;

}

//提交发生错误时调用
- (void)webView:(WKWebView *)webView didFailNavigation:(WKNavigation *)navigation withError:(NSError *)error {
    [self.progressView setProgress:0.0f animated:NO];
    dismiss(webView);
}

// 接收到服务器跳转请求即服务重定向时之后调用
- (void)webView:(WKWebView *)webView didReceiveServerRedirectForProvisionalNavigation:(WKNavigation *)navigation {
    
}

// 根据WebView对于即将跳转的HTTP请求头信息和相关信息来决定是否跳转
- (void)webView:(WKWebView *)webView decidePolicyForNavigationAction:(WKNavigationAction *)navigationAction decisionHandler:(void (^)(WKNavigationActionPolicy))decisionHandler {
    
    NSString * urlStr = navigationAction.request.URL.absoluteString;
    //CFStringRef CFURLCreateStringByReplacingPercentEscapesUsingEncoding(CFAllocatorRef allocator, CFStringRef origString, CFStringRef charsToLeaveEscaped, CFStringEncoding encoding) API_DEPRECATED("Use [NSString stringByRemovingPercentEncoding] or CFURLCreateStringByReplacingPercentEscapes() instead, which always uses the recommended UTF-8 encoding.", macos(10.0,10.11), ios(2.0,9.0), watchos(2.0,2.0), tvos(9.0,9.0));

    NSString *encodedString = urlStr;
    NSString *decodedString = (NSString *)CFBridgingRelease(CFURLCreateStringByReplacingPercentEscapes(kCFAllocatorDefault, (CFStringRef)encodedString, CFSTR("")));

    NSLog(@"发送跳转请求：%@",decodedString);
    decisionHandler(WKNavigationActionPolicyAllow);
    
    
    
}

// 根据客户端受到的服务器响应头以及response相关信息来决定是否可以跳转
- (void)webView:(WKWebView *)webView decidePolicyForNavigationResponse:(WKNavigationResponse *)navigationResponse decisionHandler:(void (^)(WKNavigationResponsePolicy))decisionHandler{
    NSString * urlStr = navigationResponse.response.URL.absoluteString;
    NSLog(@"当前跳转地址：%@",urlStr);
    //允许跳转
    decisionHandler(WKNavigationResponsePolicyAllow);
    //不允许跳转
//    decisionHandler(WKNavigationResponsePolicyCancel);
}

//进程被终止时调用
- (void)webViewWebContentProcessDidTerminate:(WKWebView *)webView{
    
}

#pragma mark -- WKUIDelegate

/**
 *  web界面中有弹出警告框时调用
 *
 *  @param webView           实现该代理的webview
 *  @param message           警告框中的内容
 *  @param completionHandler 警告框消失调用
 */
- (void)webView:(WKWebView *)webView runJavaScriptAlertPanelWithMessage:(NSString *)message initiatedByFrame:(WKFrameInfo *)frame completionHandler:(void (^)(void))completionHandler {
//    UIAlertController *alertController = [UIAlertController alertControllerWithTitle:@"HTML的弹出框" message:message?:@"" preferredStyle:UIAlertControllerStyleAlert];
//    [alertController addAction:([UIAlertAction actionWithTitle:@"OK" style:UIAlertActionStyleDefault handler:^(UIAlertAction * _Nonnull action) {
//        completionHandler();
//    }])];
//    [self presentViewController:alertController animated:YES completion:nil];
}
// 确认框
//JavaScript调用confirm方法后回调的方法 confirm是js中的确定框，需要在block中把用户选择的情况传递进去
- (void)webView:(WKWebView *)webView runJavaScriptConfirmPanelWithMessage:(NSString *)message initiatedByFrame:(WKFrameInfo *)frame completionHandler:(void (^)(BOOL))completionHandler{
//    UIAlertController *alertController = [UIAlertController alertControllerWithTitle:@"" message:message?:@"" preferredStyle:UIAlertControllerStyleAlert];
//    [alertController addAction:([UIAlertAction actionWithTitle:@"Cancel" style:UIAlertActionStyleCancel handler:^(UIAlertAction * _Nonnull action) {
//        completionHandler(NO);
//    }])];
//    [alertController addAction:([UIAlertAction actionWithTitle:@"OK" style:UIAlertActionStyleDefault handler:^(UIAlertAction * _Nonnull action) {
//        completionHandler(YES);
//    }])];
//    [self presentViewController:alertController animated:YES completion:nil];
}
// 输入框
//JavaScript调用prompt方法后回调的方法 prompt是js中的输入框 需要在block中把用户输入的信息传入
- (void)webView:(WKWebView *)webView runJavaScriptTextInputPanelWithPrompt:(NSString *)prompt defaultText:(NSString *)defaultText initiatedByFrame:(WKFrameInfo *)frame completionHandler:(void (^)(NSString * _Nullable))completionHandler{
//    UIAlertController *alertController = [UIAlertController alertControllerWithTitle:prompt message:@"" preferredStyle:UIAlertControllerStyleAlert];
//    [alertController addTextFieldWithConfigurationHandler:^(UITextField * _Nonnull textField) {
//        textField.text = defaultText;
//    }];
//    [alertController addAction:([UIAlertAction actionWithTitle:@"OK" style:UIAlertActionStyleDefault handler:^(UIAlertAction * _Nonnull action) {
//        completionHandler(alertController.textFields[0].text?:@"");
//    }])];
//    [self presentViewController:alertController animated:YES completion:nil];
}
// 页面是弹出窗口 _blank 处理
- (WKWebView *)webView:(WKWebView *)webView createWebViewWithConfiguration:(WKWebViewConfiguration *)configuration forNavigationAction:(WKNavigationAction *)navigationAction windowFeatures:(WKWindowFeatures *)windowFeatures {
    if (!navigationAction.targetFrame.isMainFrame) {
        [webView loadRequest:navigationAction.request];
    }
    return nil;
}

- (void)dealloc{
    //移除注册的js方法
    [[_webView configuration].userContentController removeScriptMessageHandlerForName:@"jsToOcNoPrams"];
    [[_webView configuration].userContentController removeScriptMessageHandlerForName:@"jsToOcWithPrams"];
    //移除观察者
    [_webView removeObserver:self
                  forKeyPath:NSStringFromSelector(@selector(estimatedProgress))];
    [_webView removeObserver:self
                  forKeyPath:NSStringFromSelector(@selector(title))];
}

- (void)didReceiveMemoryWarning {
    [super didReceiveMemoryWarning];
    // Dispose of any resources that can be recreated.
}

@end
